## explanation file for the ambient field cross-correlation functions used in Denolle et al (submitted) ###
## contact Marine Denolle at mdenolle@fas.harvard.edu for any question ##

This data sets contains ambient seismic field 9-component cross-correlations function obtained from deconvolution of seismic noise following Prieto et al. (2008) and Denolle et al. (2013). Details of the specific data processing in this data product can be found in Denolle et al (submitted). There are 31 Hi-net stations sources and 296 MeSO-net receivers (see Figure 1 of Denolle et al., submitted).

The raw data was obtained from MeSO-net stations and selected Hi-net stations from January 1st 2010 to December 31st, 2012. The raw data is detrended, demeaned, and the instrumental response was removed. The horizontal components of the boreholes (Hi-net and MeSO-net) were oriented back to true North and East using Kano et al (2015) or MeSO-net and NIED metadata (http://www.hinet.bosai.go.jp/ ).  The stacks of the cross-correlation functions are linear and raw, only windows with maximum absolute amplitudes greater than 10 times the standard deviation of the 30-minute time window.

The data is organized as follow:
Net.station_source / net.station_receiver/2010_001_00_00_00_2012_366_00_00_00_EH*.tst
Where the source channels are EHE, EHN, EHU and the receiver channels are HNE, HNN, HNU. 
Extension “tst” stands for “transfer function stack” and the data file format is in SAC binary format (reference). The headers of each file contains the SAC metadata including:

stla: station receiver latitude
stlo: station receiver longitude
stel: station receiver altitude
stdp: station receiver depth
evla: station source latitude
evlo: station source longitude
evel: station source elevation
evdp: station source depth.
user0: time series length from original window
user1: number of time series in file
user2: frequency sampling rate
user3: number of points kept in frequency spectra
user4: number of windows stacked
dist: distance in between stations
az: azimuth from source to receiver stations
baz: azimuth from source to receiver stations
gcarc: greater arc angular distance from source to receiver
npts: time series window length
kstnm: station receiver name
knetwk: station receiver network name
kuser1: station source network name
kuser2: station source name 



References:

Prieto, G. A., and G. C. Beroza (2008), Earthquake ground motion prediction using the ambient seismic field, Geophys. Res. Lett., 35, L14304, doi:10.1029/2008GL034428.

Denolle, M., E. M. Dunham, G. A. Prieto, and G. C. Beroza, Ground Motion Prediction of Realistic Earth- quake Sources Using the Ambient Seismic Field, 2013, J. Geophys. Res., Vol. 118 (5), pp. 2102-2118, doi: 10.1029/2012JB009603

Denolle, M., P. Boué, N. Hirata, S. Nakagawa, G. C. Beroza, Strong Shaking Predicted in Tokyo from an Expected M7+ Itoigawa-Shizuoka Earthquake, in prep for J. Geophys. Res.

Kano, M. et al., 2015. Azimuth verification of the MeSO-net seismographs, Zisin, 68, 31–44 (in Japanese). 


